Samsung CLP-770ND Service Manual page 4

chapter 3 Maintenance and Disassembly
3.1 Precautions when replacing parts .................................... 3-1
3.1.1 Precautions when assembling and disassembling ......... 3-1
3.1.2 Preautions when handling PBA ................................. 3-1
3.1.3 Releasing Plastic Latches ....................................... 3-1
3.2 Replacing a Maintenance Parts
3.2.1 Fuser Unit ............................................................ 3-2
3.2.2 Pick up roller ......................................................... 3-2
3.3 General Disassembly ................................................... 3-3
3.3.1 Cover Unit ............................................................ 3-3
3.3.2 Front Cover Unit ................................................... 3-6
3.3.3 OPE Unit............................................................... 3-7
3.3.4 HVPS Board ......................................................... 3-8
3.3.5 Main PBA ............................................................ 3-9
3.3.6 SMPS Board ......................................................... 3-9
3.3.7 Fuser Control Board ................................................ 3-10
3.3.8 HVPS sub board(AC Board) .................................... 3-10
3.3.9 LSU Unit ............................................................... 3-11
3.3.10 SOLENOID and CLUTCH-FEED .............................. 3-12
chapter 4 Alignment & Troubleshooting
4.1 Alignment and Adjustments ............................................. 4-1
4.1.1 Control Panel ......................................................... 4-1
4.1.2 Understanding The Status LED ................................. 4-2
4.1.3 Menu Overview ...................................................... 4-3
4.1.4 Tech Mode ............................................................ 4-7
4.1.5 Firmware Upgrade ................................................ 4-13
4.2 Troubleshooting............................................................ 4-19
4.2.1 Procedure of Checking the Symptoms ........................ 4-19
4.2.2 Display Meassage Troubleshooting ........................... 4-20
4.2.3 Feeding Problems and solutions .............................. 4-29
4.2.4 Image Quality Problems and solutions ........................ 4-36
4.2.5 Common Problems and solutions .............................. 4-42
4.2.6 Network problems and soltutions .............................. 4-43
Contents
.................................... 3-2